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Manual Downshifts

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Manual downshift testing is not required since all vehicles equipped with the 8L90 are also equipped with some form of Driver Shift Control (DSC). The TCM will automatically override DSC downshifts to protect the transmission from damage.

Coasting Downshifts

  1. Place the gear selector in the DRIVE position.
  2. Accelerate the vehicle to 8th gear with the TCC applied.
  3. Release the throttle and apply the brakes.
  4. Verify that the downshifts occur as commanded by monitoring gear ratio, which should change after commanded gear changes.
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